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BS EN 17763:2022

BS EN 17763:2022

$142.49

Centrifuges. Marine fuel centrifuges. Determination of particle separation performance and certified flow rate (CFR) under defined test conditions

Published By Publication Date Number of Pages
BSI 2022 32
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This document specifies the procedure for the determination of the certified flow rate (CFR), a performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined test procedure. This document is applicable to marine fuel centrifuges. All values reported as CFR capacities are verified measured values on a defined CFR test bench. Separation efficiency is determined by a defined particle counting method. Scaling based on Stoke’s law and disc stack design is excluded from this document.

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PDF Pages PDF Title
2 undefined
5 European foreword
6 Introduction
7 1 Scope
2 Normative references
3 Terms and definitions
8 4 Test arrangements
4.1 Test equipment
10 Figure 1 — Test rig
4.2 Test media
4.2.1 Test oil specification
4.2.2 Test oil kinematic viscosity
11 4.2.3 Test oil density
4.2.4 Test oil dispersing additive
4.2.5 Test particle specification
5 Performance test
5.1 Oil viscosity
5.2 Particle concentration
5.3 Dispersing of particles into test medium
12 5.4 Test sequence
5.5 Test procedure
5.6 Sampling
13 5.7 Particle counting
6 Analysis
6.1 Calculation of separation efficiency
6.2 Calculation of the 85 % efficiency point
14 Figure 2 — Example of separation efficiency/flow rate
6.3 Correction of measured capacities
Table 1 — Correction of measured capacities
15 6.4 Calculation of certified flow rate (CFR)
7 CFR results for similar machines (scaling)
8 Test report
16 Annex A (informative) Dispersing the particles in the test medium
17 Annex B (informative) Regeneration of test particle concentration
Table B.1 — Calculation of the amount of particles to add
18 Annex C (normative) Particle counting
C.1 General
Figure C.1 — Counting chamber according to Thoma (T)
19 Figure C.2 — Counting chamber according to Thoma, “new” (TN)
20 Figure C.3 — Counting chamber according to Neubauer (N)
21 Figure C.4 — Counting chamber according to Neubauer, “improved” (NI)
22 Figure C.5 —Illustration of glass ware with two (2) counting chambers
C.2 Preparation of the Thoma/ Neubauer counting chamber
C.2.1 Cleaning
C.2.2 Preparation for counting
23 Figure C.6 — Pushing on the cover glass with interference rings (Newton rings)
C.3 Feeding the counting chamber
24 Figure C.7 — Feeding the counting chamber using a pipette
C.4 Counting the particles within each counting field
25 Figure C.8 — Illustration of the meandering course
26 Figure C.9 — Illustration of the counted particles (black ones)
27 C.5 Formulae
Table C.1 — Symbols used for the formulae in this Annex
29 Annex D (informative) Example of correction of measured capacities
Table D.1 — Example of a test to simulate 380 mm2/s
Table D.2 — Applied correction factors
30 Bibliography

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BS EN 17763:2022
$142.49